[LLVMbugs] [Bug 19278] New: Bus error in ASTTemplateArgumentListInfo::initializeFrom

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19278

            Bug ID: 19278
           Summary: Bus error in
                    ASTTemplateArgumentListInfo::initializeFrom
           Product: clang
           Version: 3.4
          Hardware: Sun
                OS: Solaris
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: hyrosen at mail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

File: llvm/tools/clang/lib/AST/TemplateBase.cpp
Config: LDFLAGS='-m32 -Wl,-R,/opt/swt/install/gcc-4.8.1/lib'
        CXX=/opt/swt/install/gcc-4.8.1/bin/g++
        CPP=/opt/swt/install/gcc-4.8.1/bin/cpp
        CC=/opt/swt/install/gcc-4.8.1/bin/gcc
        CXXFLAGS='-m32 -Wno-unused-local-typedefs -pthreads'
        CFLAGS='-m32 -pthreads'
        ../llvm/configure
        --enable-optimized
        --prefix=.../install-sunos
        --with-gcc-toolchain=/opt/swt/install/gcc-4.8.1
        --enable-cxx11
        --enable-bindings=none

Problem:
    ASTTemplateArgumentListInfo::Create allocates memory for an
ASTTemplateArgumentListInfo object by calling ASTContext::Allocate with a
second parameter of llvm::alignOf<ASTTemplateArgumentListInfo>(). 
ASTTemplateArgumentListInfo objects are allocated with extra memory, such that
they are followed by a contiguous sequence of TemplateArgumentLoc objects.  It
happens with this configuration that the alignment of
ASTTemplateArgumentListInfo is 4 while the alignment of TemplateArgumentLoc is
8, so misaligned memory is allocated resulting in a bus error when the
TemplateArgumentLoc are accessed.

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